Tales of Tolgard
Some sages speculate that these magical plants were once treants. How they managed to get to the Infinite Layers of the Abyss is uncertain but their corruption is undeniable. Others think that they sprang from the vile soil of the plane itself. Whatever their origin, these plants should be avoided if possible.
No other wildlife ventures near these evil plants. They resemble an oak tree at a glance. Whenever a creature ventures near them, however, it attacks. It is only then that they display their mouth, tendrils, and red eyes. This is often the last sight that the native fiends of the plane see before they are consumed.